iOS 9.3 (build 13E5181f) is an official Apple over-the-air update for the iPhone 6s, released on 2016-01-14T18:01:26Z. The update package is 1.45 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0f19f3ee7a7aec71cf7fbfea5b5feeec9cd4a6a4.zip.